Earlier this week, T-Mobile finally confirmed what had been rumored about its plans for attracting iPhone users with a bring-your-own-device strategy. T-Mobile made it clear that it would be trying to explain to users the benefit of its lower prices for unlimited service, even in the shadow of needing to buy a full-price, unsubsidized iPhone. The carrier mentioned that it would be using iPhone 4S models as demo units in its stores, but what of the coming iPhone 5? A leaked documents shows that the iPhone 5 is very much in T-Mobile’s plans, as the carrier will be introducing its own nano SIM card to support the smartphone.

The leaked doc is very clear about the intent for the nano SIM, noting that only the iPhone 5 currently needs one, and not any devices native to T-Mobile’s stable. Sure, it’s also a bit of future-proofing, and ensures the carrier will be ready for the day when it does have hardware requiring the new cards, but it really speaks to how serious T-Mobile might be about its chances for attracting iPhone users.

T-Mobile plans to have its nano SIMs ready by mid-October. Considering just how much you might stand to save compared to iPhone service on the other carriers, are any of you seriously considering signing-up? Would you wait and see just how quickly T-Mobile builds-out its 1900MHz coverage, first?